Impact of electrode geometry on an atmospheric pressure surface barrier discharge

Hasan, MI, Morabit, Y, Dickenson, A and Walsh, JL
(2017) Impact of electrode geometry on an atmospheric pressure surface barrier discharge. APPLIED PHYSICS LETTERS, 110 (26). 264101-.

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Several of the key characteristics of an atmospheric pressure surface barrier discharge (SBD) are heavily dependent on the geometrical configuration of the plasma generating electrodes. This paper reveals that increasing the surface area of an SBD device by reducing the gaps within the electrodes can have major and unforeseen consequence on the discharge properties. It is experimentally demonstrated that a critical limit exists when reducing the diameter of a circular electrode gap below 5 mm, beyond which the required breakdown voltage increases exponentially and the power deposited in the discharge is impeded. Using a numerical model, it is shown that a reduced electrode gap diameter yields a decrease in the voltage difference between the electrode and dielectric surface, thus lowering the maximum electric field. This study indicates a link between the electrode geometry and the nature of the reactive chemistry produced in the plasma, findings which have wide-reaching implications for many applications where multiple closely packed surface barrier discharges are employed to achieve uniform and large area plasma processing. The authors are grateful for the support of the UK Engineering and Physical Sciences Research Council (Project No. EP/N021347/1) and Innovate UK (Project No. 50769-377232). Figure source data can be found at:

Item Type: Article
Uncontrolled Keywords: 40 Engineering
Depositing User: Symplectic Admin
Date Deposited: 29 Aug 2017 09:58
Last Modified: 20 Jun 2024 23:41
DOI: 10.1063/1.4985030
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